Obviously the mini would look more in place and not out of place like the original iPad looked. For a mold you could cover up the iPad (and I do mean cover up!) and fiberglass over the backside to get a mold of the backing and somewhere make a notch so that you could pop it in and out as needed. Would be plenty strong then sand/paint and mold it to the bezel.
Or find a case that will work and mold that into the bezel.
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